Drill jig



' "July INVENTCIR- Y ATTURNEY- Patented. 27, 1926.

l isinofiin` LINnQiiis'r, oF nnfrnoir, ivtcnieniv, Assisiionyro {rrinjvixson coin- 1 A1W,oii Y Dn'rnoi'r. MICHIGAN., A CORPORATION or, MICHIGAN.

" DRILL .116.1 Q

' 1Appiiafqnniedqime 3o, 1921.. semaine. 481,'691.'

This'invention relates -in general'to iin-fr proveniente in the art of manufacturing similar-objects in quanti-ty, Land relates incre j specifically to .improi'femen'ts inthe coiistriicf` tion `and operation of jigs for hold-ing objects 'Whilethe'saine are being operatedupon y'by a drill" or? other machine tool, and forj` subsequently f performinga linishing operation upon the bodies;

A nfobject o f gthe'inventionis to provide a drill ji'g or similar device,`vvhi`ch is1 simple in' construction and 'eiiicient-in operation.` nliother object` of the invention isto proj vide improved .nieansfor holding 'successive objects While vthe same' are being operated upon byfadrill' or other machine toolJ' A' furtlierobject ofthe invention is-to provide a jigmeniber which is ycapable of performing a machining Vfunction uponobjectslield` by the jig.' Still anotherfobject'of 'the` in1` ventionfis to provide improved means forv enabling' insertion land removal of obj ects finto and from' a jig'.- Thesey and. other .ob jects and advantages of the presentinven-1 2o tion, and the manner in Which 'they may be attained Will be vapparent from1v thel follow?y ing description.' 1 i Afclear conception of Ian embodiment of" the invention and of the operation Vof a `vice constructed in accordance' therewitli may be had referring to the' drawing accompanying'and v-fo'rming'a part of this specification, in fvvhic'hflile reference char`v 1 acter designate tlie saine or similar pa'rtsin the varionsvievvsv Y drill jig.

.j Fig.' 3/is a vertical section'tlirough the" improved j ig,`sh owing theelements .ina posi# tion different Afrom thatillustrated in the preceding figures. y 1

Fig. 4 is a fragmentary vertical sectional view ofthe improvedv jig, the section being taken to the `leftof the holding` and dressing` member looking toward this member.-

1 llhe drill jig illustrated in Figs. `l, .Q andfy 3 comprises in' general a main frame or base @ya combined gripping andshearing nie'rn-f` berj, a drill guiding plate 7, a stock'gage1 Fig. l is a plan 'vienT of' an improved drill jig adaptedto'hold' elevis pins and similarproperly operated. upon; 1

which are separated arecess'QS and. each of which is kprovided at its end with ,ailinclined" spieadiiigzfsurfaoe 123. Thespring The combined object gripping and shear# ing member 3 illustrated infdetailin ,4, 4.comprises a pairuof springarms 'orfjavv's arms orfjaws `of tlie'nie'mber 3 are provide-d" With gripping surfaces shaped 'to hug the @levis .pinsf or `other objects which the jaivs are formedto grip. The edges 25 of tions from the clevis pins iorotherobjects,

`'lo :the gripping jawsare l'formed as cutters adapted to .shear bu'rrs. and f otherl1 projecf when said objects are 'moved Within and relatively-tothe j'a'ivs. Tlie member 3 is 4flirnilvf secured to the base 2 by 'means ofa clamp 2'? andinayl be adjusted so'as to properly ,so `Thedrill guide plate'jffis 'secured to the. v

bis@ 2* nier-any @i the' mmbeiejgby 'maiis of a clamp '28. This guide plate 7 has a ver-?.

airis offth'eclevispin 4. The positionof the plate drilled' in the clevis -j oiii'4:.y The'location fof fx1-and, ofthe guide hole `'Qslnthereiiif 'partiaily determines the location of theli'o'le 1 tion-of tlie'stoclt gage 5 Whiclivlias asnpj- 1 1 porting rodv 29 adjustably secured to an 1 arm of ythe-base.'2 by means of an adjusting` 1 1 set screw 19. By moving lthe stoclv'gage nearer tothe giiideplate; the lholes Will be drilledv nearer 'the and vicefversa.

l The clevisf'pin'ejectingfmechanisni com-fv i prises an yejectinjgg' j ilunger'S having alo'vvei;

longittidinal recess 17 and an upper'trane4` verse shoulderl, 'a1latcli19 engageable with "tlie'shoulderQQ -to inove" the ,plungerv S for? ivardly, a helical 'tension' spring 12 forlfief tracting tliepliinger 8, aV rocker farm li'for gfoperatingtlie"'latch1/9 'and Ithe spreading .Wedge 6, and Y manually manipulable nicchan'isinl 14e' foroscillating thev rockerI ai'mf 13.

' licads of the. cievis pins 4? ies",

lll

l spring 12.

ylhe forward end of the plunger 3 is of reduced cross sectional area and is adapted to abut against the. rear end of a clevis pin 4 held within the jaw member 3. The helical tension spring 12 is attached to the rear end of the plunger 8 andat all times tends to urge the plunger 3' rearwardly against stop pin 16 secured to the base 2. The rocher arm 13 is pivotally associated with the main frame or base. 2 by means of a transverse horizontal pivot vpin 21. rEhe latch 9 is pivotally connected to the upper extremity cf the rocker arm 13 and has a forward inclined surface which is adapted to an inclined surface 13 on the main frame 2 in order tol elevate the latch D outl of engagement with the abutment or shoulder 22 of the plunger 3'.

The upper side portion of the rocher arm 13 is provided with a laterally inclined surface 11 which isengageable with a cam 1() formed integral with Ithe rear end of the jaw spreadingl wedge 6. The spreading wedge 6 is vertically pivotally associated with the main frame 2 by means of a pivot pin 15. The wedge 6 is adapted to engage the sui'- faces 23of the object gripping jaws as shown in Fig. 4, in order to release an object or clevis pin 4 held by the member 3. The jig may also be provided with means for conducting cooling and lubricating fluid against the drill and clevis pins, such means having been omitted in order to clarify the disclosure.

During normal operation of the jig, and with the mechanism at rest, the guiding plate 7 and stock gage 5 shouldlirst be properly set to accommodate clevis pins 4 of a definite length. The several elements of the jig are positioned as illustrated in Fig. 3, with the plunger 8 fully retracted by the The wedge 6 may then be brought into engagement with the surfaces 23 to spread the gripping jaws, by manually moving the rocker arm 13 forwardly and causing the rocker arm surface. 11 to engage the wedge cam 10. llVhen the gripping jawsl of the member 3 have been thus spread, an undrilled clevis pin 4 may be freely inserted through the gage plate 5v and the member 3 and positioned as shown in Fig. 3. The wedge 6 may then be withdrawn from the surfaces 23 by releasing the rocker arm 13, such release permitting the spring jaws of the member 3 to firmly grip the intervening clevis pin 4 and to force the wedge 6 outwardly. The clevis pin 4 is then in position for drilling and the drill may be lowered through the opening 24 of the gage plate Z which properly locates the cot-ter pin hole.

Alfter a hole has been thus drilled, the drillis withdrawn and burr is 'ordinarily left protruding from the clevis pin 4 adjacent to the newly drilled hole. In order to remove this burr, the rocher arm 13 is swung rearwardly until the latch 9 drops into enga gement with the abutment or shoulder 22 of the plunger 8. With the latch 9 thus interlocking with the plunger shoulder 22, the rocker armj13 is swung forwardly urging the plunger 8 forward and into direct en'- gagement with the front end of the object or clevis pin 4. As the plunger 8 continues its forward travel, it pushes the object or clevis pin4 axial-ly and transversely of the cutting edges 25 of the gripping member 3, to the position shown in Figs. 1 and 2, thus causing the cutting edges 25 to shear ed' burrs which may have been produced during the drilling operation, and neatly dressing the. clevis pin 4.

,after the burrshave been thus removed., the. forward movement of the rocker arm 13 is continued until the dressed clevis pin 4 is pushed completely out ofthe jaws of the gripping member 3, whereupon `the clevis pin may be removed in any convenient manner. Simultaneously with this removal of the finished clevis pin 4, the latch 9 rides over the inclined surface 13 of the-@nain frame or base 2, thus disengaging the latch 9 from the plunger shoulder 22 and permitting the spring 12 to become'etlective to automatically and quicklyretract or withdraw the plunger 3. Simultaneously with this retraction of the plunger 8, the rocher arm surface 11 engages the cam 10 thus swinging the wedge 6 inwardly about its pivot pin 15 and into engagement with the inclined surfaces 23 of the gripping jaws. The gripping jaws are thus yautomatically spread and held open thereby permitting insertion of a fresh undrilled object or clevis pin 4. The cycle of operations may 'then' be repeated and successive clevis pins 4 rapidly drilled and finished.

l/Vhile the 'device has been shown as being especially adapted to hold and to remove burrs from clevis pins 4 after the same have been provided with cotter pin holes, it will be obvious that the principles-of the invention are readily applicable to jigs for holding and for otherwise dressing objects of various shapes and sizes. The adjusting set screws 19, 20 permit variation in the location of the drilled holes and also permit drilling of clevis pins of various lengths. The jaw member 3 may be readily constructed from a rectangular bar of tool steel or similar material, and effectively serves the double function of initially holding and subsequently trimming the successive clevis pins 4.

lt should be understood that it is not desired to limit the invention to the exact details of construction and of operationherein shown and described, `for various modifications withinfthe scope of the appended claims may occur to persons skilled in the art.

itil! l l. fr jig comprising an element having` resilient bifurcations termedv to grip an .'ob-

ject and havingCutting` ed-Q'esvadja-ceiit vto their gripping portions, and means for mov.n

ing the untrinime'd portion of an objecty gripped by ysaid jaws toward said cutting,` j

moving 'said objectrelatively edges. v j j j .1 .Y l2. A jig comprising an element having opposed resilient bifurcations ormedtolaterally grip an object therebetween and havl ingcutting edges adjacent to their gripping portio .5, and means for movingthe bi'irred portion of an object gripped between ysaid jaws toward said cutting edges.

3. A comprising a pair spring jaws formed `to vresiliently grip an object and having cutting edges adjacent to their gripping portions, and means ormov- `ing vthe untrimined portion of an object gripped by said jaws toward said'cutting edges. Y

4l. A jig comprising an element having` 1 resilient bifurcations provided with recessesl forming an `enlarged opening between sail` bifurcations, said biturcationshaving Acutting edges adjacent to said recesses and beyingbiased toward each other, and means for inovingan object disposed withinsaid opening and gripped by said bifurcations toward said` cutting edges. v Y f 5. A ig comprising a pair of jaws formed to resilient-ly grip 'and to simultaneously trim .j

an object, and means for spreading said jaws. 6. A jig comprisingl apair of integral jaws formed to simultaneously grip and trim an object, and means for spreading said jaws.

LA jig comprising a pair ofjjaws formed to resiliently transversely grip an object, mea/ns for removing said objectvby. urging the same laterally between said-jaws, andA means on. saidjaws `i'or cuttingsai'd object during said removahv v 8. A jig comprising a pair of resilient jaws for transversely gripping an elongated object, lmeans tor removing said object by moving the saine longitudinally between said jaws, and means on said jaws for trimming said object during said removal.

9. A' 'i0' comprising-a air` of resilient jaws adapted to laterally grip an elongated object, saidjaws having cutting edges ooaotable with an object- `gripped therebetween,

and means for removing a grippedobject jaws longitudinally from between.` l.said whereby said edgesoiit said object. j l0. A. jig comprising a pair-ot integral jaws forming a grippingand `shearing eley ment, means for moving an object gripped by said element whereby said object is sheared, and means 'for subsequently spreading said jaws object. V

11. Aijig comprising a pair otconnected y of 'integral to release the grip upon said` object moved therebetween, and means in-` sei'tible directly between said jaws to release said object. f f I n to said ljaws whereby said object vvis trimmed.v 137A jig comprising.l a pair ofl rigidly united gripping j for holding an lobject in p roper relation to fa "machine tool, a

integral spring adapted vto hold anob--L ject, a plunger for moving said object while held by said jaws, and a wedge insertablebe.-

tween said jaws to release'said object.`

l5. A jig'oomprising .a pair et spring Vresilient, gripping jaws adapted .tofciit an plunger for. moving saidobject while held betweensaid jaws,andmeans for spreading jaws adapted to laterally grip an elongated object, Vsaid jaws having cutting edges ,co-

sting with an'obje'ct gripped therebetween, means for movinga gripped vobject transversely-within said jaws wherebysaid edges cnt said object, and means for spreading said jawsto release said gobject.

16. A'jig comprising an element having integral spring jaws adapted to laterally grip an object, a plunger for moving an ob" ject gripped byl said jaws transversely thereof, means on'said jaws lfor cutting an 4object 'thus moved, and meansiior separating said` jaws to 'release ysaid object. l?.

grip an object, a plunger for niovingan object gripped. by said'jaws transversely therek of, said jaws having cutting. edges adapted Vto trim van object thus moved, and a wedge insertable .between said javs for releasing' said object.

18. A ji ycom Jrisingan'element havino"` l D integral spring jaws adapted i' to laterally grip a fcylindr'eal object, meansl lfor machining an object ,gripped by' said` jaws, Ameans forys'ubseqiiently moving saidobjeot withinsaid jaws to perform a 'ifinishing finie-v tion upon said object, and vmeans *tor subseiientlf sureadinn .sa-id "awe to release the i within said jaws to remove the burr produce-d during drilling, and wedge insertable be?` tweensaid aws to release said object.

Y A. jig comprising an element having integral spring jaws a'dapted'to laterally' ln testimony whereoi'the signature ot the inventoris aiiiied hereto.

' Bissen w.'LITUDQULSTil 

